The worldwide COVID-19 pandemic was declared two years ago on March 11, 2020. Our reporters stationed around the world take us to places that show how life has changed — or hasn’t — since the declaration was declared. Hear from Bianca Hillier in Boston’s Chinatown, Lucía Benavides in Barcelona, Halima Gikandi in Nairobi, and Rebecca Kanthor in Shanghai, where COVID-19 cases are ticking up again.